Dual-Passage Shock Absorber Throttle Layout for Stable Damping
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Solution Overview
Problem
Existing shock absorbers face challenges in achieving stabilization in damping force performance.
Innovation Solution
The shock absorber incorporates a first passage with a first damping force generation mechanism in the piston and a second passage with a second damping force generation mechanism in the piston rod, featuring a throttle member with notch parts at regular intervals to form a throttle flow path with a constant flow path area, and includes a frequency-sensitive part to adjust damping force based on piston frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a throttle member with notch parts is provided in the second damping force generation mechanism, then the damping force can be adjusted, but the damping force performance becomes unstable due to variations in attachment position
Solution Approach 1:
The invention introduces asymmetric groove parts on the piston rod that correspond to the notch parts on the throttle member. By configuring the groove parts with specific depths and positions, the attachment position of the throttle member is constrained to predetermined locations where the flow path area remains constant. This asymmetric configuration ensures that the damping force performance is stable and reliable, eliminating the variability caused by random attachment positions.
2Adaptability or versatility
If the flow path area of the throttle flow path varies with attachment position, then the throttle member can be adjusted, but the damping force performance cannot be stabilized
Solution Approach 1:
The groove parts on the piston rod and notch parts on the throttle member are configured to work together automatically. When the throttle member is attached, the groove parts guide it to predetermined positions where the flow path area is inherently constant. This self-aligning mechanism ensures that the damping force performance is stabilized without requiring external adjustment or intervention, making the system both adaptable and reliable.
3Device complexity
If a single passage is used for damping force generation, then the structure is simple, but the damping force performance cannot be optimized across varying piston frequencies
Solution Approach 1:
The invention divides the damping force generation system into two separate passages: a first passage for generating a first damping force and a second passage for generating a second damping force. Each passage can be independently configured with different throttle members and groove parts, allowing optimization for different piston frequency ranges. This segmentation enables the shock absorber to provide optimized damping force performance across a broad spectrum of operating conditions while maintaining reasonable structural simplicity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design achieves stabilization in damping force performance by providing consistent and adjustable damping forces across varying piston frequencies.
Implementation Method 1
a throttle member provided in the second damping force generation mechanism, having a plurality of notch parts at substantially regular intervals in a circumferential direction to form a throttle flow path in the second passage due to the notch parts
Implementation Method 2
a first damping force generation mechanism provided in the first passage to generate a damping force, a second damping force generation mechanism provided in the second passage to generate a damping force
Data Source
AI summary
A shock absorber includes a first passage provided in a piston and through which a working fluid moves from a chamber on an upstream side to a chamber on a downstream side in a cylinder due to movement of the piston, a first damping force generation mechanism provided in the first passage to generate a damping force, a second passage (141) provided in a piston rod (21), and a fixing member fixed to the piston rod (21) to form the second passage (141), and a second damping force generation mechanism provided in the second passage (141) to generate a damping force, in which a throttle member (161) provided in the second damping force generation mechanism, including a plurality of notch parts (171) at substantially regular intervals in a circumferential direction to form a throttle flow path (76) in the second passage due to the notch parts (171), and formed to have a flow path area of the throttle flow path (76) that is constant regardless of an attachment position thereof in the circumferential direction is further provided.